Cloudflare DNS vs Google DNS?

Recently I was introduced with new public cloudflare DNS servers which said to be faster than google public DNS and fastest in the world.

Howerver, I used them for about 2 weeks and I faced multiple issues such as slow propagation of websites, some websites takes time to update, and even takes time to load or not connect at all.

It maybe a temporary issue due to their new service but I immediate switched back to google. Did any of you face this issue?

Secondly, does Google or cloudflare public DNS afffect my ip address location? I see that when I perform DNS leak test I see different servers mostly USA based and once I use google DNS i see Singapore servers in DNS leak test. What are your thoughts?